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7605222 |
Copolyetherimides
Copolyetherimides compositions having high glass transition temperatures and outstanding ductility are presented. The copolyetherimides having M w of at least 40,000 comprising isomeric...
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7544445 |
Polyelectrolyte membrane and production method therefor
A polymer electrolyte membrane comprising a microporous polymer membrane having pores penetrating through the opposite sides thereof. The microporous polymer membrane holds a mixture of a polymer...
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7408018 |
Elastomeric functional biodegradable copolyester amides and copolyester urethanes
The invention provides elastomeric copolyester amides, elastomeric copolyester urethanes, and methods for making the same. The polymers are based on α-amino acids and possess physical, chemical...
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7402650 |
Process for preparing polyarylate having high thermo-resistance and high transparency
A process for preparing polyarylate wherein a bivalent phenol compound having the structure of Formula 1 and an aromatic dicarboxylic acid halogen compound react to prepare a polyarylate, and...
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7211639 |
Composition comprising functionalized poly(arylene ether) and ethylene-alkyl (meth)acrylate copolymer, method for the preparation thereof, and articles prepared therefrom
A thermoplastic composition includes a functionalized poly(arylene ether) and a copolymer of (a) ethylene or an α-olefin, and (b) an alkyl(meth)acrylate. Optional components in the composition...
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7169878 |
Diamines, polyimide precursors and polyimides produced by using the diamines, and liquid crystal aligning agents
A diamine compound represented by the formula (1):
wherein R 1 is a trivalent organic group, each of X 1 and X 2 is a bivalent organic group, X 3 is an alkyl or fluoroalkyl group having...
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7148314 |
Process for preparation of functionalized polyimides
A method for preparation of a sulfonic and or sulfonic acid salt containing polyimide resins comprising melt reaction of a polyimide resin with an organic compound, wherein the organic compound...
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7135540 |
Polyhydroxyalkanoate copolymer including unit having bromo group in side chain and method for producing the same
The invention provides a polyhydroxyalkanoate having a bromo group in a unit and being thermally stable and capable of arbitrarily controlling physical properties, and a producing method thereof....
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7129318 |
RTM and RI processable polyimide resins
Polyimide resins that are suitable for processing by resin transfer molding (RTM) and resin infusion (RI) methods at reduced processing temperatures are provided. The inventive RTM and RI...
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7078477 |
Process for producing solvent-soluble polyimide
In the process of the present invention, a solvent-soluble polyimide is produced by polycondensing at least one tetracarboxylic acid component with at least one diamine component in a solvent in...
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7074882 |
Polyimide resin for electrical insulating material
The present invention provides a polyimide resin for an electrical insulating material which comprises a polyimide resin having a repeating unit represented by general formula (I):
wherein R 1 ...
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7074880 |
Polyimide aerogels, carbon aerogels, and metal carbide aerogels and methods of making same
A preparation process of polyimide aerogels that composed of aromatic dianhydrides and aromatic diamines or a combined aromatic and aliphatic diamines is described. Also descried is a process to...
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7071282 |
Benzimidazole diamine-based polyetherimide compositions and methods for making them
Disclosed herein are polyetherimide compositions comprising structural units of the formula:
derived from at least one benzimidazole diamine, wherein R 1 and R 2 are independently selected...
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7070966 |
Method for obtaining polyhydroxyalkanoates (PHA) and the copolymers thereof
The invention relates to an enzymatic-chemical method for obtaining polyhydroxyalkanoates (PHA), especially polyhydroxybutyrate (PHB), or the copolymers thereof, from biomass. The inventive method...
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7026436 |
Low temperature polyimide adhesive compositions and methods relating thereto
The present invention relates to a polyimide adhesive composition having a polyimide derived from an aromatic dianhydride and a diamine component, where the diamine component is preferably about 50...
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7022810 |
Proton exchange membrane materials for the advancement of direct methanol fuel-cell technology
A new class of hybrid organic-inorganic materials, and methods of synthesis, that can be used as a proton exchange membrane in a direct methanol fuel cell. In contrast with Nafion® PEM materials,...
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7019103 |
Polyamic acid oligomer, polyimide oligomer, solution composition, and fiber-reinforced composite material
A terminal-crosslinkable polyamic acid oligomer having 1) heat resistance indicated by Tg of 300° C. or more and a pyrolysis temperature of 500° C. or more, 2) toughness, and 3) capability of...
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7015304 |
Solvent free low-melt viscosity imide oligomers and thermosetting polyimide composites
This invention relates to the composition and a solvent-free process for preparing novel imide oligomers and polymers specifically formulated with effective amounts of a dianhydride such as...
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6979721 |
Substituted cyclohexene endcaps for polymers with thermal-oxidative stability
This invention relates to polyimides having improved thermal-oxidative stability, to the process of preparing said polyimides, and the use of polyimide prepolymers in the preparation of prepregs...
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6956098 |
High modulus polyimide compositions useful as dielectric substrates for electronics applications, and methods relating thereto
The substrates of the present invention comprise a polyimide base polymer derived at least in part from collinear monomers together with crankshaft monomers. The resulting polyimide material has...
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6927274 |
Resin compositions, processes for preparing the resin compositions and processes for forming resin films
Polyimide precursors contained in resin compositions of the present invention have a polymer structure unit represented by formula (1) below:
wherein chemical structure A 2 includes an...
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6924348 |
Polyamide acid and polyimide, and optical material
A polyimide excelling in heat resistance, chemical resistance, water repellency, dielectric characteristics, electrical characteristics, and optical characteristics and a polyamide acid useful as...
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6919422 |
Polyimide resin with reduced mold deposit
A polyimide composition and a process to prepare polyimide resins with reduced plate out and mold deposits is described. During resin molding operations the low plate out resins show a longer...
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6919418 |
Approach to reduce cyclics formation in 3-CIPA based polyetherimide polymers
Methods of reducing the amount of undesirable cyclic oligomer by-products in the production of polyetherimides are disclosed. The resulting polyetherimides have enhanced thermomechanical properties.
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6916898 |
Process for producing polyimide
A process of preparing a polyimide of the present invention comprises effecting an imidization reaction of a diamine and a tetracarboxylic dianhydride in a solvent containing 50 to 100% by weight...
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6911519 |
Low viscosity melt processable high temperature polyimides
A series of low melting and low viscosity phenylethynyl end-capped polyimides (PETIs) possessed of long term thermal and mechanical stability useful as films, melt coatings, adhesives, matrix and...
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6908685 |
Polyimide film, method of manufacture, and metal interconnect board with polyimide film substrate
The invention provides a polyimide film manufactured from a polyamic acid prepared from pyromellitic dianhydride in combination with 10 to 60 mol % of phenylenediamine and 40 to 90 mol % of...
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6891067 |
Optical polyimide precursor, optical polyimide compound and fabricating method thereof
The present invention provides an optical polyimide precursor for use in making a polyimide. The precursor is defined by the following formula:
wherein X is Cl, Br, oxo-halide, or fully...
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6890626 |
Imide-benzoxazole polycondensate and process for producing the same
A polyimide-based polycondensate which may be used as an insulation film by coating a copper foil with the polycondensate and by heating the coated copper foil, which insulation film does not warp...
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6887967 |
Thermosetting polyimide resin composition process for producing polyimide resin, and polyimide resin
A thermosetting polyimide resin composition is provided which comprises a polyimide resin and an epoxy resin, which has excellent heat resistance, low dielectric constant and low dielectric loss...
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6887580 |
Adhesive polyimide resin and adhesive laminate
An adhesive polyimide resin which comprises a siloxane polyimide resin obtained from (A) an aromatic tetracarboxylic dianhydride and (B) a diamine ingredient comprising (B1) a diamine having a...
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6881815 |
Method for the preparation poly(etherimide)s
A method for the synthesis of poly(etherimide)s comprises the reaction of 4-halotetrahydrophthalic anhydride with an activating primary amine to yield an activated 4-halotetrahydrophthalimide....
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6852828 |
Poly amic acid system for polyimides
A poly amic acid precursor containing a combination of tetrahydrofuran and N-methylpyrrolidinone as cosolvents is described. Utilizing the combination of tetrahydrofuran and N-methylpyrrolidinone...
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6852826 |
Manufacturing method of polyamic acid, and polyamic acid solution
In a step of polymerizing polyamic acid by mixing tetracarboxylic acid dianhydride and diamine and polycondensating the tetracarboxylic acid dianhydride and diamine under the presence of a...
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6849706 |
Copolyetherimides
Copolyetherimides comprise phthalimide structural units comprising both 3- and 4-linkages, wherein the designations 3-linkage and 4-linkage refer to the isomeric positions on the phthalimide ring...
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6824642 |
Phenyl-linked oxazole cyanates as dielectrics having good adhesive and filling properties
The following invention relates to phenyl-linked polybenzoxazoles having terminal, aryl- or heteroaryl-attached cyanate groups which can be used for adhesive bonding and as dielectrics, especially...
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6797344 |
Aromatic diamine derivatives, the preparation thereof and alignment film materials containing same for liquid crystal display cell
New aromatic diamine derivatives and the preparation thereof are disclosed. The diamine derivatives of the present invention can be added to conventional polymerization reactions of tetracarboxylic...
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6784275 |
Active energy ray-curable polyimide resin composition
Disclosed is an active energy ray-curable polyimide resin composition which comprises a polymerizable polyimide resin (I) having an isocyanurate ring, an alicyclic structure, an imide ring and a...
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6780960 |
Method of making a polyimide in a low-boiling solvent
A method of making a solution of a polyimide from a diamine monomer and a dianhydride monomer is disclosed. A solution or slurry of one of the monomers in a solvent that boils at a temperature...
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6777525 |
Heat, moisture, and chemical resistant polyimide compositions and methods for making and using them
Polyimides having a desired combination of high thermo-oxidative stability, low moisture absorption and excellent chemical and corrosion resistance are prepared by reacting a mixture of compounds...
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6774203 |
Method for producing liquid crystalline polyester
The present invention provides a method for producing a liquid crystalline polyester which is produced from an aromatic carboxylic acid, an aromatic hydroxycarboxylic acid, an aromatic diol and/or...
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6770733 |
Polyimide copolymer
A film-formable polyimide copolymer, which comprises two kinds of tetracarboxylic acid dianhydride consisting of (A) pyromellitic acid dianhydride and (B) 3,3′,4,4′-benzophenonetetracarboxylic...
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6750317 |
Material and additive for highly crosslinked chemically and thermally stable polyhydroxyamide polymers
Polyhydroxyamides are polymerized to form highly-crosslinked, temperature-stable polymers. The polyhydroxyamides include as their central, parent structure a benzenetricarboxylic acid to which side...
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6740371 |
Diaminobenzene derivative, polyimide obtained therefrom, and liquid-crystal alignment film
An alkyldiamine having excellent polymerization reactivity, a polyimide comprising it as a constituting element, and a liquid crystal alignment film excellent in uniformity of liquid crystal...
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6737503 |
Aromatic diamine and polyimide thereof
The aromatic diamine compound of the present invention is represented by the following formula (1), and from the aromatic diamine compound a polyimide having a repeating unit represented by the...
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6737502 |
Method of synthesizing polyimides
A solvent-free, catalyst-free and contamination-free method of synthesis of polyimides is disclosed. The method includes polymerizing a diamine with 2,2-bis(3,4-dicarboxyphenyl)hexafluoropropane...
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6710160 |
Polyamic acid, polyimide, process for producing these, and film of the polyimide
Disclosed are a polyamic acid having repeating units represented by the formula (1): wherein the norbornane skeleton of comprises four components of and their contents satisfy the following:...
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6642348 |
Melt processable PMR-type polyimides
The present invention provides PMR-type polyimides that exhibit lower melt viscosities than PMR-type polyimides of the prior art. These PMR-type polyimides are created by incorporating flexible...
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6596839 |
Wholly aromatic polyester and production process therefor
A process for producing a wholly aromatic polyester which is excellent in heat resistance, mechanical properties and yet color and has a high degree of polymerization by melt polymerizing a...
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6586555 |
Processes of preparing condensed polymers with polycarboxylic acids and polyamines
This invention provides processes of the preparation of polyamides, polyimides, and polyamideimides, which are easy to purify after reactions, from polycarboxylic acids and polyamines in high yield...
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